An innovative approach to the preparation of coloured and multifunctional silk material with the natural extracts from chestnut shell and black rice bran

Goud

J Food Process Engineering

2018

In the present study, the adsorption and desorption behaviors of anthocyanin in the aqueous solution of purple rice bran were investigated using amberlite XAD2, XAD4, XAD7, activated charcoal, and bentonite as adsorbents. The diffusion mechanisms of anthocyanin on adsorbents were also investigated. Amberlite XAD7 showed higher adsorption/desorption capacities and recovery of anthocyanin from purple rice bran extract over other adsorbents. The recovery of anthocyanin from XAD7 was 41.49% while adsorption and desorption capacities were 1.87 and 1.79 mg/g, respectively. The adsorption behavior of anthocyanin indicated that the process was better explained by pseudo‐first‐order kinetics than pseudo‐second‐order kinetics model. Adsorption isotherm behavior of anthocyanin on adsorbents was found to be homogeneous and more suitable for Langmuir (two parameters) and Redlich–Peterson (three parameters) isotherm models. The adsorption mechanisms of adsorbents were well explained by intra‐particle diffusion model and indicated that XAD7 has the higher diffusion rate than the other adsorbents. In addition to that, the phytochemical profiling of the separated and concentrated bran extract was investigated using HPLC in terms of anthocyanins, cyanidin‐3‐glucoside, peonidin‐3‐d‐glucoside, and phenolic acid content. Practical applications The present study shows the adsorption/desorption behavior and mechanism of anthocyanin from purple rice bran extract on the various adsorbents. The study also shows the diffusion mechanisms of anthocyanin on various adsorbents. From the application point of view, this work could be facilitated the industrial production of anthocyanin from purple rice bran as a natural food colorant using adsorption process. Moreover, the study is helpful in understanding the adsorption of anthocyanin as well as designing the adsorption systems.

Section: Resultsmentioning

confidence: 99%

Adsorption/desorption, diffusion, and thermodynamic properties of anthocyanin from purple rice bran extract on various adsorbents

Goud

J Food Process Engineering

2018

“…The vibrations of active components (C3G and P3G), which were the main components of rice bran, were different between before and after by PEF-AWE. Both of before and after PEF-AW displayed peak vibrations of the hydroxy groups at 3292 cm −1 (O–H stretching), which were the characteristic of phenolic ring 36 , 37 . Smaller peak intensities were noticed on the spectral data of the rice bran of BRG after extraction due to the lower concentration of hydroxy groups of phenols which rich in C3G and P3G.…”

Section: Discussionmentioning

confidence: 99%

Optimization of the pulse electric field assisted extraction of black rice grain for antioxidant and sirtuin1 enzyme stimulation activities

Salee

Chaiyana

Yawootti

et al. 2022

Sci Rep

Cyanidin-3-glucoside (C3G) and peonidin-3-glucoside (P3G) in black rice grain (BRG) demonstrate many beneficial health effects, including antioxidant and anti-aging properties. This research aimed to study on pulsed electric field assisted water extraction (PEF-AWE) on BRG using pre-treatment technique, which was determined for enhanced yields of C3G and P3G, antioxidant and sirtuin1 enzyme stimulation activities. The effects of operating parameters for PEF-AWE (intensity of electric field, X1: 3–5 kV/cm, number of pulse, X2: 1000–3000 pulse and BRG/water ratio, X3: 0.1–0.5 g/mL) were determined using regression analysis and optimized PEF-AWE condition using the response surface methodology. Regression models showed the intensity of electric field and BRG/water ratio were the strong influence parameters significantly on C3G (p < 0.01). The results highlighted optimized conditions of PEF-AWE followed by 5 kV/cm, 3000 pulse and 0.5 g/mL leading to achieve higher C3G (92.59 ± 4.79 mg/g) and P3G (4.59 ± 0.27 mg/g) than no pre-treatment by PEF process, approximately 60%. Additionally, PEF extracts of BRG can modulate the ability of surtuin1 enzyme to deacetylate substrate proteins (26.78 ± 0.50 FIR). Thus, PEF-AWE can be applied to produce BRG extract as natural antioxidant compound and functional ingredient.

“…According to Otutu et al [20], dye extraction of colourants at 70°C for 4 h is applicable to produce an optimum amount of natural dye in water [21]. Figures 1 -10 show the effects of extraction temperature and time on the extracts.…”

Section: Dye Extractionmentioning

confidence: 99%

Extraction and Application of Natural Colourant from the Bark of Berlinia Grandiflora on Cotton and Polyamide 6 Fabrics

Asiagwu

Otutu

Onyesom

et al. 2021

eijs

The aim of this study is to extract and utilise the bark of Berlinia grandiflora as a natural dye source for the colouration of cotton and polyamide 6 fabrics. The solvents used for this study were water, methanol, acetone, and methanol/potassium hydroxide. The best of all the solvents used was water. In the extraction process, the various solvents were extracted with Soxhlet extractor. The optimum colourant extraction was observed at 40 °C for 2 h. The extracted compound was isolated and characterized by UV spectrophotometry; proton and carbon-13 nuclear magnetic resonance, mass spectrometry, and Fourier transform infrared spectroscopy. Mordanting and subsequent dyeing of cotton and polyamide 6 fabrics with the extracted colourant were performed to investigate the dye’s efficiency. Two metal salts, namely copper sulphate and stannous chloride, were used as mordants. Furthermore, the washing, rubbing, and light fastness properties of dyed samples were tested. The results of the fastness tests showed that the natural dye gave light fastness value (3= fair) without the use of mordants, whereas the values were 5 on cotton and 4 on nylon 6 with the use of mordants. The results of fastness of rubbing and washing were excellent for both cotton and nylon. The outcome of the study presents a potentially useful natural colourant for the colouration of natural and synthetic fibers.